//一行显示。。。。 
ellipsis()
	white-space:nowrap
	text-overflow:ellipsis
	overflow:hidden
// 强制折行
break-word()
	word-break:break-all 
	word-wrap:break-word

//宽度百分比
bfb(a,b)

	100% * (a / b)
//三角形
sanjiaoxing(a,b,c,d,f)
	if c==''
		content:''
		display:block
		height:0
		width:0
		position: absolute
		border-top:a solid f
		border-left:b solid transparent
		border-right:d solid transparent
	if a==''
		content:''
		display:block
		height:0
		width:0
		position: absolute
		border-left:b solid transparent
		border-bottom:c solid f
		border-right:d solid transparent
//三角形
radius(a,b,c,d)
	if a==''
		border-top-right-radius:b
		border-bottom-right-radius:c
		border-bottom-left-radius:d
	if b==''
		border-top-left-radius:a
		border-bottom-right-radius:c
		border-bottom-left-radius:d
	if c==''
		border-top-left-radius:a
		border-top-right-radius:b
		border-bottom-left-radius:d
	if d==''
		border-top-left-radius:a
		border-top-right-radius:b
		border-bottom-right-radius:c
	
